David Hume: An Enquiry Concerning Human Understanding SECTION II: OF THE ORIGIN OF IDEAS

(...)By the term impression, then, I mean all our more lively perceptions, when we hear, or see, or feel, or love, or hate, or desire, or will. And impressions are distinguished from ideas, which are the less lively perceptions, of which we are conscious, when we reflect on any of those sensations or movements above mentioned.(...)

Would the necrotic idea be the refutation of cause and rationality? Because the first time I read Hume he poisoned me and I ended up disbelieving most of my cherished beliefs, it spread like a cancer and I stopped being sure of anything.

thank Y for the feedback. The concept of "idea" by Hume (different from the concept of Aristotele, Platone, kant etc etc) refers to something we have felt in the pass (that we have, in one sense, just 'decoded'). I tried to rappresent the process of "forget" like for example processing a grief...(sorry for my horrible english )

I see, I thought you were referring to a specific thought process that Hume himself admitted he wanted to escape. And yeah, Hume proved that all our ideas can only come from something we have experienced.